She put a small piece of it in her mouth.

她把一小块放进嘴里。

youdao

Her mouth is small and red.

她的嘴巴小小的，红红的。

youdao

One of the Polish students was Klara, about 24, rather small, with the classic Slavic look: clear skin, good cheekbones, a pouty mouth, and a slyness in her blue eyes.

学生里有个波兰来的女生叫克拉拉，大约24岁，身材娇小，典型的斯拉夫相貌：皮肤白皙，颧骨优美，嘴巴翘着，蓝眼睛里带一丝狡黠。

youdao

The irregularity of her features, her straight, dry hair, her small mouth, all caused her to cringe inwardly and suddenly to feel vulnerable.

NEWYORKER: In Other Rooms, Other Wonders

The young woman waiting in the arrivals hall looks anxious, her small mouth pinched and unsmiling.

BBC: On holiday in North Korea